RISC-V is pleasant to write and simple enough to write an reasonably performing interpreter for I guess.

Note I am not OP and I do not endorse this message.

Yep, and since C was mostly used as an ISA abstraction, then with a real, good enough, worldwide royalty free ISA and not vendor locked, we can expect much more assembly written libraries and programs.

A side effect is to kiss bye bye significantly to the planned obsolescence of much system software and some computer language syntaxes.

"I don't know what C is used for but I want to make a Big Statement."